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copied!<p>From the <a href="https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/attachment.rb" rel="nofollow">paperclip github project</a>:</p> <p><a href="https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/attachment.rb" rel="nofollow">https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/attachment.rb</a></p> <pre><code># Returns the public URL of the attachment with a given style. This does # not necessarily need to point to a file that your Web server can access # and can instead point to an action in your app, for example for fine grained # security; this has a serious performance tradeoff. # # Options: # # +timestamp+ - Add a timestamp to the end of the URL. Default: true. # +escape+ - Perform URI escaping to the URL. Default: true. # # Global controls (set on has_attached_file): # # +interpolator+ - The object that fills in a URL pattern's variables. # +default_url+ - The image to show when the attachment has no image. # +url+ - The URL for a saved image. # +url_generator+ - The object that generates a URL. Default: Paperclip::UrlGenerator. # # As mentioned just above, the object that generates this URL can be passed # in, for finer control. This object must respond to two methods: # # +#new(Paperclip::Attachment, Paperclip::Options)+ # +#for(style_name, options_hash)+ def url(style_name = default_style, options = {}) default_options = {:timestamp => @options.use_timestamp, :escape => true} if options == true || options == false # Backwards compatibility. @url_generator.for(style_name, default_options.merge(:timestamp => options)) else @url_generator.for(style_name, default_options.merge(options)) end end </code></pre> <p>By default paperclip appends a timestamp parameter, pass <code>:timestamp => false</code> to the <code>url</code> method of your attachment: </p> <pre><code>image = Magick::ImageList.new('public' + @picture.photo.url(:original, :timestamp => false)) # => "public/system/photos/115/original/Kitchener-2011103100531.jpg" </code></pre> <p><strong>Edit:</strong> Actually, looks like they changed the option name since this didn't work for me with Paperclip 2.4.0. After inspecting my own source, the option is <code>:use_timestamp</code> but on github it's <code>:timestamp</code> - choose which one depending on the version of Paperclip you're using.</p>

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